Thomas s



Apr. 24, 1923. 1,452,792

T. s. COOPER, JR

AUTOMATIC`DAMPER Filed Sept. 9. 1921 l; slik l Patented Apr. 24, 41923.

Timms s. coornn, Jn., or enAnLnsToN, wssT sssreNon To KOOPER 17mm? co..- orrnmennrrnm, PENNSYLVANIA. l

A AUTOMATIC nutren.

sspucaonfhisa september e, 1s21. serial No. grasses.

To all whomz't concern.' n I if Beit'known that-I,.Tno1s;As S." CoorER,

Jr., a citizen oft-hefUnitedl States, residing at Charleston, 'in the county of' Kanawha y -shaft 6`of the damper extends across the l and State f'West- Virginia, haveuinvented Others certain new and useful Improvements e in Automatic Dampers; and I dodecla're theV following to j be 'a .full, .clear,. and' exact. description of the invention, such as willenable skilledin the' art to which it apper' tains to make and 'use the s ame.

. My-inventin aimsvto provide a simple, inexpensive and practical-thermostatie damper for use in dwellings; factory and mill'stacks, the construction being such that the damper plate, the shaft on which said plate is mounted, and the thermostat constitute a unitary article so that loss of parts prior to -installationwill not take place.

` A further object of the invention is to providemeans whereby the damper may be adjusted by h and whenever advisable and heldin adjusted position by unique means.

With the foregoing in view, the invention resides in the novel subject .matter herein- 'after described and claimed, the. descriptive matter being supplemented by thefaccompanying drawings.

Figure 1 is a plan vlew of a. damper con-` structed in .accordance with my invention, showing the same applied to a smoke pipe,

' the latter being illustrated in vertical section.

Figure 2 is -a vertical section as indicated by line 2-2 of Fig. 1.

Figure 3 is a horizontal section'taken on .line H of Fig. 1.

Figure-'4 i detail elevationyillustrating more particularly "the manuall adjusting means forthe damper.

Figure 5 is a detail I the construction at Aone endof the supporting shaft. In the the numeral 1 designates a short length of smoke pipe which may well be a part of an ordinary stove pipe, or part of a smoke stack such as those used mills. In installing my invention'in ,the pipe 1, I form a relative y small opening 2 at one side thereof and amuchlarger opening 3 atr the diametrcally opposite side, the metal perspective view' of' drawings' abovabrieayassc'ribed.'

in factories and catingowith said opening. The supporting -pipe 1 and has one en'd rotatably received in the opening 2, val 1ile'the other endof said shaft is providedwith an -enlarged head 7 rof approximately circular form, said headbeing received in the opening 3 and being j provlded with a 1 suitable' handle 8. By meansofsuitable bearings 9, the damper plate 10 is mounted onthe shaft so that the j two may turn relatively, and said plate is provided with an outwardly extending lin-V ger 11 which is received in a. notch 12 in the peripheral portion of the head 7 said notch preferably extending throughout one-quarter of the circumference of said head. Thus, the dampen will be limited in its opening andclosing movement and by viewing the finger' 11 from the exterior of the pipeathe angle at which the damper plate is setting, can be readily seen. The periphery of the head 7 is formed with a circumferentially extending4 groove 13 which receives the vmetal surrounding the opening 3,v whereby to hold the head against axial movement and con shaft 6. order that the head may be positioned vin the opening 3, it is necessary to turn the metal at opposite sides of the split 4 outwardly; This having been done, the

uently preventing removal ofl 'the' head may be easily inserted, after which-the metal is bent back in place. The outer side wall of the groove 13, in the embodiment of the invention herein shown, is provided with aninwardly extending oppositely tapered cam 14 and directly opposite cam, the

other wall of saidgroove-is formed with, a

gradually deepening notch 16. When it is desired to rotate the head and shaft, in order that the damper plate 10 maybe set by'` hand, the handle 8 may be used. g this'operation, the cam 14 orinthe metal of the Vpipe 1v into the n 1 and thus the heady will be any position to which it may be moved. In one position'ofthe shaft, the cam 14 may snap into the notch 5.

'frictionally bound in y me-v The damper-plate 10 is-provided with-a longitudinally extending slot 17 whose end passing said end (designated by the reference numeral 19) through a slot 2O inone of the bearings-9. The other end of the v thermostat is pinnedor otherwise secured to the shaft as indicated at 21. r1`wo suiti able metals having different coetlicients of expansion are used in constructing the thermostat 18, so that it will be acted upon by excess heat to close the damper plate 10 across the pipe. 1, while reduction in temperature will cause the inherent resiliency of the thermostat to return said plate to an open position. The finger 11 and the end walls of the notch 12 serve to limit both the opening and closing movement of the damper plate and the finger also serves as an indicator so that the position of the damper may be seen from the outside of the pipe 1, permitting manual adjustment to be made whenever desirable by means of the handle 8.

From the foregoing, taken in connection with the accompanying drawing, it will be seen that a comparatively simple and inexpensive thermostatic damper has been pro-- vided, yet one which will be highly efficient and desirable in use, particular attention bey ing directed to the fact that the damper as manufactured and placed on sale constitutes a single unit, all parts thereof being connected with each yother in such manner 4that they cannot become accidentally de- "tached and lost. This is highly advantageous from a commercial standpoint, as it facilitates packing, demonstration in sales rooms and stores, and delivery to the point at which it is vto be used.

from the details disclosed, they are 'preferably followed, but it is to be understood within the sc ope of the invention as claimed, that numerous changes may be made.

I claim:

1'. The combination, with a shaft having a handle, and a thermostatic damper rotatable on said shaft; of a head`on one end of said shaft adapted to be rotatably received inra'n opening in the pipe in which the damper is used, said head having a ciry, cumferential groove to receive the metal at the edge of the opening, one wall of said groove having an inwardly extending cam and I'fthe-.other wall of said groove being provided with a notch opposite said cam.

- 2. The combination with' a pipe having; ldlametrically opposed openings, a shaft ex- Since excellent results have been obtainedsaid openings, said head having a circum.

ferential roove to receive the metal at the edge of sald opening, which metal is formed with a notch, one wall of said groove having an inwardly extending cam adapted to be received in said notch, the opposite wall'of said groove having a notch opposed to said cam.

- 3. The combination with a shaft having a handle and a thermostatic damper on said shaft; of a head on one end of said shaft adapted to be rotatabl "received in an opening in a pipe in whic the damper is used, said head having a notch extending 'throughout approximately ninety degrees of its circumference, and a finger on the damper plate received in said notch to limit the movement of said damper plate, means being provided to hold the against rotation.

4;. A damper shaft having a head adapted to be rotatably mounted in an opening in the wall of a conduit when the shaft is extended transversely4 through the conduit, said head having a peripheral groove for receiving the material surrounding the opening, one wall of the groove having an inwardlyextending cam for engaging the head normally wallof the conduit and the other wall of the groove being provided 'with a notch disposed opposite said cam to permit the material of the conduit wall to be forcedinto the notch and ablyl shaft.

5.' The structure set forth in claim 4'having a segment of the periphery of said head cut away to provide a notch, a damper plate carried by said shaft, and -a stop finger damper plate extendngfrom said damper plate and extending into the notch of the shaft head.

6. A damper embodying a plate provided with a central slot to accommodate a spring, bowed straps extending across'said slot, the straps being bowed on opposite sides of the faces ofthe plate to provide bearings, a shaft extending across the plate longitudinally' of the slot with the straps engaging the shaft. for rotatably mounting the plate on a shaft, and a finger extending from the periphery of said plate longitudinally of the shaft and projectablefthrough an open ing iny a pipe having the damper mounted therein, said finger being disposed in a plane with the plate so that it ywill serve las an indicator to disclose the angle at which the plate is disposed in the pipe, said finger also functioning as ,a stop for engaging spaced abutments to limitthe rotation of the plate.

provide a friction lock yieldf I preventing rotation of the damper 7. The combination with a shaft havin a head being provided with cam means for handle, and a damper on said shaft; o? a frictionally engaging metal of the pipe head on one end of said shaft adapted to be about the opening 'and yieldably holding 10 rotatably received in an openingr in the pipe the shaft against rotation.

5 in which the damper is used, said head hav- In testimony whereof I have hereunto set ing a circumferential groove to receive the my hand.

metal at the edge of the opening and said 'THOMAS S. COPER, Jn. 

